Do you already own a tractor with a loader? I'm all for renting, but if I already have something, that's what I'm going to use. In my experience, concrete breaks up pretty easy once you get that first piece in the air. Then you drop it and it breaks into smaller pieces that are easy to pick up with the loader bucket.
At my place, I like to use busted up concrete to fill in ditches and control erosion. I haven't done anywhere close to what you are doing, so it's going to take a lot longer, but like everything, you just put in the time and eventually it gets done.
I would be very happy to have that much concrete all piled up somewhere. I would use it when I needed it and hope the pile lasts a long time.
Now that I have goats, I've found that chunks of concrete work great for blocking holes under the fence that the baby goats work their way through. The little guys are very persistent at finding weak areas under the fences to the chicken area, and they really don't have anything better to do then try to get to the chickens food. One or two good sized pieces of broken up concrete work great for this. Unfortunately, it's a never ending war that the baby goats never give up on!!!
The farther you move any type of bulk material, the more expensive it gets. Find a place as close as you can to the road where it's not an eye sore, and pile it up there.